4 files changed, 16 insertions, 4 deletions

@@ -136,6 +136,10 @@ void Generate::initPanel() {
   if (pathWidth != 1)
     _panel->pathWidth = pathWidth;  // Init path scale. "1" is considered the
                                     // default, and therefore means no change.
+
+  if (hasFlag(Config::WriteInvisible)) {
+    _panel->SetInvisibleSymmetry(true);
+  }
 }
 
 // Place a specific symbol into the puzzle at the specified location. The
@@ -225,9 +225,13 @@ std::string Panel::Write() {
   }
 
   serializer.writeInt(0);
-  serializer.writeByte(Serializer::NegationsCancelNegations |
-                       Serializer::PrecisePolyominos |
-                       Serializer::FlashForErrors);
+
+  char settings = Serializer::NegationsCancelNegations |
+                  Serializer::PrecisePolyominos | Serializer::FlashForErrors;
+  if (_invisible_symmetry) {
+    settings |= Serializer::InvisibleSymmetry;
+  }
+  serializer.writeByte(settings);
 
   return serializer.str();
 }
@@ -169,6 +169,8 @@ class Panel {
   int get(int x, int y) { return _grid[x][y]; }
   void set(int x, int y, int val) { _grid[x][y] = val; }
 
+  void SetInvisibleSymmetry(bool val) { _invisible_symmetry = val; }
+
   std::string Write();
 
   enum Style {
@@ -447,6 +449,7 @@ class Panel {
   float minx, miny, maxx, maxy, unitWidth, unitHeight;
   int _style;
   bool _resized;
+  bool _invisible_symmetry = false;
 };
 
 #endif /* end of include guard: PANEL_H_FC471D68 */
@@ -56,7 +56,8 @@ class Serializer {
     PrecisePolyominos = 4,
     FlashForErrors = 8,
     FatStartpoints = 16,
-    CustomMechanics = 32
+    CustomMechanics = 32,
+    InvisibleSymmetry = 64,
   };
 
   enum GapType : char { GapNone = 0, GapBreak = 1, GapFull = 2 };